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Average effective dose from a single examination

Flying at 8 km for 10 hours

2.8 x 10~8

1 hour gives 2.8 x 10 mSv

Figure A.16. Comparison of doses from different sources.

Figure A.16. Comparison of doses from different sources.

receiving a dose of 10-20 mSv. The second most important source, 0.4 mSv, is from the medical use of radiation. It has an increasing trend, thanks to increasingly available medical radiation facilities. The third cause is the fallout from past weapons tests; i.e., 0.005mSv. The value has been decreasing thanks to the Treaty Banning Nuclear Weapon Tests, the maximum value being reached in 1963, when it was 7% of the natural background. Other man-made sources, like the Chernobyl accident and nuclear power production, are much smaller, 0.002 mSv and 0.0002 mSv, respectively.

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